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LOS ANGELES — “Fast & Furious” star Paul Walker was killed by injuries from both the impact and subsequent fire when the Porsche his friend was driving smashed into a light pole and tree, according to an autopsy released Wednesday.

The actor died from the “combined effects of traumatic and thermal injuries,” according to the autopsy released by the Los Angeles County coroner’s office.

The 2005 Porsche Carrera GT was driven by Roger Rodas, who was dead from “multiple traumatic injuries” before the car exploded in flames, the autopsy said.

Walker starred in all but one of the six “Fast & Furious” blockbuster films that glorified fast cars and dangerous driving.

Sheriff’s investigators are still trying to determine what caused Rodas to careen out of control Saturday. They have said speed was a factor in the crash about 30 miles northwest of downtown Los Angeles.

Meanwhile, Universal Pictures announced that it has shut down production for an unspecified time on “Fast & Furious 7.”

The seventh installment of the street racing series started shooting in September and was on break for the Thanksgiving holiday.